Attachment for miter boxes



June 9, 1925.

F. GILPIN ATTACHMENT FOR MI'IER BOXES Filed Jun 30, 1924 2 Shets-Shee'i: 1

INPENTOR Francis Gil Din,

as $3346. filler-125; H

Patented June 9, 1925 UNITED STATES FRANCIS GILIPIN, OF COLORADO SPRINGS, COLORADO.

ATTACHMENT FOR METER, BOXES.

Application filed June 30, 1924:. Serial No. 723,242.

appear as the description progresses.

Although I show the preferred form of my invention and recommend this form, I do not thereby limit myself to the precise embodiment as herein shown, but wish it understood that various changes in details of construction may be made within the scope of what is hereinafter claimed, without departing from the spirit of the invention.

Similar reference characters refer to like,

parts throughout the several views. Figure 1 is a plan view of the invention; Fig. 2 a rear elevation; Fig. 8, a transverse vertical cross section of a miter box and the attachment; Fig. 1, an end and a front elevation of a front plate; Fig. 5, an end and a rear view of a rear plate; Fig. 6, a side elevation of a vise jaw; Fig. 7 a sectional elevation of a slide 5 and fragment of a screw; Fig. 8 a cross section of screw 19, and Fig. 9, a fragment of frame 1, showing hole 2% with threads 25.

The invention comprises a frame 1 adapted to be attached to a miter box B as shown in Fig. 3, said frame having upper and lower guidebars 2 and 3 forming a guideway therebetween; two slides, each having front and rear plates 6 and 7 to form flanges thereon, the rear plates 7 having aplurality of pairs of holes 8, 9; 10, 11, and 12 therein; threaded bolts 13 and 14; extending through each plate 7; vise jaws 15 and 16 having pairs of lugs 15 thereon adapted to fit into the pairs of holes in said plates 7; nuts 17 and 18 having handles 17 and 18, screwed on bolts 13 and 14 against said vise jaws; quick acting vise screws 19 and 20 screwed through threaded holes, adapted therefor,at the ends of said guideway and connected to slides 4: and 5 respectively, the connection being shown in Fig. 7 handles 19 and 20 on said screws; a Vernier 21 on the upper guide bar 2, and pointers 22 and 23 on plates 7.

When attached to a miter box B as shown in Fig. 3 the material M is clamped be tween jaws 15 and. 16 by turning handles 19 and 20 on screws 19 and 20. The work may be moved to the right or left with respect to the saw S and tenons may be cut ,when the work is held vertical and miters or dovetails may be cut when the work is held at an angle. To hold the work at an angle of say 4C5 degrees it is first necessary to turn the vise jaws to the angle desired. This is accomplished by loosening nuts 17 and 18 and turning jaws 15 and 16 until lugs'15 fit into holes 12 or 8 in plates 7 andtightening nuts 17 and 18. When work is held between the vise jaws in this position and the saw S set at 90 degrees in the horizontal plane, a miter cansbe cut. To set the vise jaws at 90 degrees, lugs 15 areplaced in holes 10 in plates 7, in which position tenons may be out, the thickness of said tenons being gauged by turning screws 19 and 20 and thereby bringing pointers 22 and 23 to the proper polnts on the Vernier 21. To cut a dovetail of 62 degrees the vise jaws 17 and 18 are turned sothat lugs 15 fit into holes 9 or 11, depending on which side is being cut. The rigidity with which the work is held enables the operator to cut as small a portion as half a kerf in thickness.

This attachment is adapted, to be attached to an ordinary miter box without altering said box by simply bolting it to the underside of said miter box as shown in Fig. 3, and also may be used as a clamping device without being attached to a miter box.

It is obvious that the range of angular adjustment of said vise jaws may be in- 1 creased by adding more holes in plates 7 in the path of lugs 15.

When the grooves 26 in screws 18 and 19 are in line with threads 25 said screws may be slid longitudinally until jaws 16 and 17 are near the material M, at which point said screws are turned which 'cause the threads 27 to engage the threads 25 and thereby clamp the material M tightly between said jaws.

Full threaded screws working in full threaded holes may be used instead of the quick acting screw.

The miter saw S may be turned to any angle in the horizontal plane and the jaws 16 and 17 moved to the proper point under the saw for cutting angles in the horizontal plane. By turning jaws 16 and 17, as described, and swinging the saw S to an angle different from ninety degrees, cuts may be made which are oblique in both the horizontal and vertical planes.

The device may be made integral with the miter box and nonrotatable vise jaws may be used if desired.

Having described my invention, what I claim as new and desire to secur by Letters Patent is:

1. In a device of the class described, the combination of a frame adapted to be attached to a miter box, said frame having an upper and a lower guide bar forming a guideway having a threaded hole at each end of said guideway; two slides, each having a front and a rear plate secured thereto forming flanges thereon, disposed in said guideway; threaded means engaging the threaded holes and the slides, the rear plates having a plurality of holes therein; vise jaws pivotally mounted on the slides and having means for engaging the holes thereof; for the purposes set forth. 7

2. In a device of the class described, the combination of a frame adapted to be attached to a miter box, said frame having an upper and a lower guide bar forming a guideway therebetween, having a threaded hole at each end of said guideway'; two slides, each having a front and a rear plate secured thereto forming flanges thereon, disposed in said guideway; threaded means engaging the threaded holes and the slides, the rear plates having a plurality of holes therein; vise jaws pivotally mounted on the slides and having means for engaging the holes thereof; a threaded bolt extending through each rear plate; for the purposes set forth.

3. 111a device of the class described the combination of a frame adapted to be attached to a miter box, said frame having an upper and a lower guide bar-forming a guideway therebetween, and connections having a threaded hole at each end of said guideway; two slides, each having a front and a rear plate secured thereto forming flanges thereon, disposed in said g'uideway; threaded means engaging the threaded holes and the slides, the rear plates having a plurality of holes therein; a threaded bolt extending through each rear plate; a vise jaw, having a pair of lugs thereon adapted to lit the holes in said rear plates mounted on each of said threaded bolts; a nut screwed on each of said threaded bolts to hold said vise jaws rigid; for the purposes set forth.

i. In device of the class described, the combination of a frame adapted to be attherebetween, and connections and connectionstached to a miter box, said frame having an upper and a lower guide bar forming a guideway therebetween, and connections having a threaded hole at each end of said guideway; twoslides, each having a front and a rear plate secured thereto forming flange-s thereon, disposed in said guideway, the rear plates having a plurality of holes therein; a threaded bolt extending through each rear plate; a vise jaw, having a pair of lugs thereon adapted to fit the holes in said rear plates, mounted on each of said threaded bolts; a nut screwed on each of said threaded bolts to hold said vise jaws rigid; a quick acting vise screw mounted in each of the threaded holes at the ends of said guideway, and connected to the adjacent slide; for the purposes set forth.

5. A device of the class described, comprising a frame adapted to be attached to a miter box, said frame having a pair of guide bars at the rear thereof forming a guideway, and connections having a threaded hole at each end of said guidew'ay; two slides, each having a pair of plates secured thereto forming flanges thereon, the rear plates having depressions therein; a threaded bolt extending through each rear platea vise jaw, having a pair of lugs thereon adapted to fit into said depressions, mounted on each of said threaded bolts; athreaded nut secured on each of said threaded bolts against each vise jaw; a quick acting screw mounted in each threaded hole at the end of said guideway and connected to the adjacent slide; a vernier mounted on the upper guide bar; and a 'j'ioi nter on each rear plate; for the purposes set forth.

6. In a device of the class described, the combination of a frame adapted to be attached to a miter box, said frame having a longitudinal guideway at the rear thereof, and a'threadedhole at each end of said guideway; a screw mounted in'each threaded hole; a pair of slides, each connected to one of said screws and disposed in said guideway; and a vise jaw mounted on each slide; for the purposes set forth.

7. In a device of the class described, the co'mbination'of a frame adapted to be attached to a miter box, said frame having a longitudinal guideway at the rear thereof, and a threaded hole at each end of said guideway; a screw mounted in each thread ed hole; a pair of slides, each connected to one of said screws and disposed in said guideway; and a rotatable vise jaw mounted on each slide; for the purposes set forth. 8. A clamping device for miter boxes, comprising a frame having a guide way therein and a threaded hole at each end of said guide way; a screw mounted in each threaded hole; a slide connected to each screw and disposed in said guide way, and a vise jaw mounted on each slide; for the pur pose of holding material at right angles to the plane of the miter box to facilitate the cutting of tenons dovetails, miters and the like.

9. The combination of a miter box and a clamping device mounted thereon, said device comprising a frame having two threaded holes and a screw carrying a Vise jaw mounted in each threaded hole; for the purpose of holding material at right angles to the plane of said miter box to facilitate the cutting of tenons, Initers, dovetails and the like.

FRANCIS GILPIN. 

